Any hydraulic fitting gurus here?

Ultradog MN · Jun 14, 2022

Am making up new power steering lines on
this tractor.
Went to four different hydraulic houses
yesterday looking for a flare nut for this
3/8in fitting. No one sells one!
Finally the last place I went to the guy
measured the flare angle with a special
tool and told me it is a regular type of
fitting like you hook up your water heater
or barbeque grill. Get one at Menards.
Sheesh!
Additional info:
Fitting in photo is factory silver soldered
to the back end of the reservoir.
It is the return line so little or no
pressure.
Flare nut I bought is brass.
Question:
Do I double flare the line?
Thanks!

Geo-TH,In · Jun 14, 2022

I would use a single flare, if it's under no pressure. I've only seen double flares used on steel high pressure brake lines..
Menards sell a cap for the flare fitting so you could cap it off, remove the plug and use whatever hose and fitting you want..

The return line to my terramite hydraulic reservoir looks like a 1 inch radiator hose (oil resistant) and a radiator hose clamp..

RodinNS · Jun 14, 2022

If you think you can get a double flare on it, you giv'er. I've had one going for 20 or more years on the supply line with a single flare. I find it very, very difficult to get a double flare on 7/16 steel line with hand flaring tools.

Rod

Ultradog MN · Jun 14, 2022

Glad to see you back on the boards Rod.
Thanks.

Hobo,NC · Jun 14, 2022

No doubt a double I also doubt you could make a single without splitting the tube. I made a post about putting unions in my P.S. lines to make it easy to split the tractor but cannot find it. Actually I was repairing a rub thru around the hood I cut the hole out and put a standard union in the line.

pete 23 · Jun 14, 2022

Sure looks like a 37 degree flare fitting on that tank to me which is standard for hydraulic fitting. Water pipes etc use a 45 degree fitting.

We had a special 37 degree flaring tool for hydraulic fitting at the dealer. BUT, being a return line, it will most likely hold ok for you with what you have. It doesn't work good at all on high pressure fittings though from my experience, single or double flare.

Steve@Advance · Jun 14, 2022

If you have some extra tubing, might try some flaring practice first.

I've never been able to do a double by hand. Even singles will split if you try to go too big.

I would just try a single unless you think it won't tighten down.

They make a nut with a flare reinforcing fitting inside. Not sure if it's compatible with your fitting.

tom upton · Jun 14, 2022

No single flare is fine. But you need a tube nut AND sleeve. Cant tell by pic if 37 degree or 45 degree, but a simple little protractor will tell you. Not sure why just about any hydralics place would not have? You may get away with your brass nut but personally I would try to get a steel nut and sleeve.

stevieb49829 · Jun 14, 2022

Like others have said, looks like a 37 degree JIC hydraulic connection. Surplus Center may have the flare nut you are looking for, but normally that would have been a flare fitting swaged onto the end of a hydraulic hose.

Hobo,NC · Jun 14, 2022

A double flare in your hood should be second nature to your local mechanic. That green armor coated line in your pix is a bear to work with.

https://forums.yesterdaystractors.com/viewtopic.php?p=4189216&highlight=double#4189216

moresmoke · Jun 14, 2022

Its a 45 deg 3/8 fitting. In 3/8 size, the threads are smaller in 37 deg than 45. All the other sizes of flare fittings, the threads interchange.

Nothing wrong with using a brass nut on a low pressure line. Double flare on the tube would be best, but a single will hold.

Any hydraulic fitting gurus here?

Ultradog MN

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Geo-TH,In

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RodinNS

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Ultradog MN

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Hobo,NC

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pete 23

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Steve@Advance

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tom upton

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stevieb49829

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Hobo,NC

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moresmoke

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